Added the new object LoginUrl and the new field login_url to the InlineKeyboardButton object

Author: pengrad

library/src/main/java/com/pengrad/telegrambot/model/request/InlineKeyboardButton.java

@@ -11,6 +11,7 @@ public class InlineKeyboardButton implements Serializable {
 
     private String text;
     private String url;
+    private LoginUrl login_url;
     private String callback_data;
     private String switch_inline_query;
     private String switch_inline_query_current_chat;
@@ -28,6 +29,11 @@ public InlineKeyboardButton url(String url) {
         return this;
     }
 
+    public InlineKeyboardButton loginUrl(LoginUrl loginUrl) {
+        login_url = loginUrl;
+        return this;
+    }
+
     public InlineKeyboardButton callbackData(String callbackData) {
         callback_data = callbackData;
         return this;

library/src/main/java/com/pengrad/telegrambot/model/request/LoginUrl.java

@@ -0,0 +1,35 @@
+package com.pengrad.telegrambot.model.request;
+
+import java.io.Serializable;
+
+/**
+ * Stas Parshin
+ * 04 June 2019
+ */
+public class LoginUrl implements Serializable {
+    private final static long serialVersionUID = 0L;
+
+    private String url;
+    private String forward_text;
+    private String bot_username;
+    private Boolean request_write_access;
+
+    public LoginUrl(String url) {
+        this.url = url;
+    }
+
+    public LoginUrl forwardText(String forwardText) {
+        forward_text = forwardText;
+        return this;
+    }
+
+    public LoginUrl botUsername(String botUsername) {
+        bot_username = botUsername;
+        return this;
+    }
+
+    public LoginUrl requestWriteAccess(boolean requestWriteAccess) {
+        request_write_access = requestWriteAccess;
+        return this;
+    }
+}

library/src/test/java/com/pengrad/telegrambot/TelegramBotTest.java

@@ -1351,4 +1351,21 @@ public void onFailure(GetMe request, IOException e) {
     public void toWebhookResponse() {
         assertEquals("{\"method\":\"getMe\"}", new GetMe().toWebhookResponse());
     }
+
+    @Test
+    public void loginButton() {
+        String text = "login";
+        String url = "http://pengrad.herokuapp.com/hello";
+        SendResponse response = bot.execute(
+                new SendMessage(chatId, "Login button").replyMarkup(new InlineKeyboardMarkup(new InlineKeyboardButton[]{
+                        new InlineKeyboardButton(text).loginUrl(new LoginUrl(url)
+                                .forwardText("forwarded login")
+                                .botUsername("pengrad_test_bot")
+                                .requestWriteAccess(true))
+                })));
+        assertTrue(response.isOk());
+        InlineKeyboardButton button = response.message().replyMarkup().inlineKeyboard()[0][0];
+        assertEquals(text, button.text());
+        assertEquals(url, button.url());
+    }
 }